fix

AutoTurnOver.DB/report_invest_return_dao.cs

@@ -114,7 +114,7 @@ select sku from dc_report_invest_return_sku
                     gmt_update_time = DateTime.Now,
                     project = "隐矩",
                     sku = item.bailun_sku,
-                    sku_name = item.sku_title_cn,
+                    sku_name = item.sku_title_cn??"",
                     warehouse_type = "国内仓"
                 };
                 if(item.sku_title_cn!=null && (item.sku_title_cn.IndexOf("DE-")==0 || item.sku_title_cn.IndexOf("DE ")==0))